What is a file to Base64 encoder?
A file to Base64 encoder reads file bytes and converts them into text. You can output raw Base64 or a data URL that includes the file MIME type.
How to use it
- Choose a file from your device.
- Pick raw Base64 or data URL output.
- Copy the encoded result into your test payload, fixture, or API request.
Example
Input: report.pdf
Output: data:application/pdf;base64,JVBERi0x...
Common mistakes
- Base64 makes files larger, so avoid encoding large production assets unless the receiving system requires it.
- Raw Base64 does not include a MIME type.
- Some APIs expect no data URL prefix. Use raw Base64 for those systems.
Related tools
- Reverse the conversion with Base64 to file.
- Encode images with Image to Base64.
- Encode PDFs with PDF to Base64.
Privacy and security
The selected file is read locally in your browser and is not uploaded by this tool.